xep-0084/avatar: add option to open avatar directly

Change:
`/avatar me@somewhere.org` -> `/avatar get me@somewhere.org`

New:
`/avatar cmd feh`
`/avatar open me@somewhere.org`

Implement https://github.com/profanity-im/profanity/issues/1281

src/command/cmd_ac.c

@@ -242,6 +242,7 @@ static Autocomplete logging_group_ac;
 static Autocomplete logging_group_color_ac;
 static Autocomplete color_ac;
 static Autocomplete correction_ac;
+static Autocomplete avatar_ac;
 
 void
 cmd_ac_init(void)
@@ -965,6 +966,11 @@ cmd_ac_init(void)
     autocomplete_add(correction_ac, "on");
     autocomplete_add(correction_ac, "off");
     autocomplete_add(correction_ac, "char");
+
+    avatar_ac = autocomplete_new();
+    autocomplete_add(avatar_ac, "get");
+    autocomplete_add(avatar_ac, "cmd");
+    autocomplete_add(avatar_ac, "open");
 }
 
 void
@@ -1276,6 +1282,7 @@ cmd_ac_reset(ProfWin *window)
     autocomplete_reset(logging_group_color_ac);
     autocomplete_reset(color_ac);
     autocomplete_reset(correction_ac);
+    autocomplete_reset(avatar_ac);
 
     autocomplete_reset(script_ac);
     if (script_show_ac) {
@@ -1429,6 +1436,7 @@ cmd_ac_uninit(void)
     autocomplete_free(logging_group_color_ac);
     autocomplete_free(color_ac);
     autocomplete_free(correction_ac);
+    autocomplete_free(avatar_ac);
 }
 
 static void
@@ -3773,9 +3781,19 @@ _avatar_autocomplete(ProfWin *window, const char *const input, gboolean previous
 {
     char *result = NULL;
 
+    result = autocomplete_param_with_ac(input, "/avatar", avatar_ac, TRUE, previous);
+    if (result) {
+        return result;
+    }
+
     jabber_conn_status_t conn_status = connection_get_status();
     if (conn_status == JABBER_CONNECTED) {
-        result = autocomplete_param_with_func(input, "/avatar", roster_barejid_autocomplete, previous, NULL);
+        result = autocomplete_param_with_func(input, "/avatar get", roster_barejid_autocomplete, previous, NULL);
+        if (result) {
+            return result;
+        }
+
+        result = autocomplete_param_with_func(input, "/avatar open", roster_barejid_autocomplete, previous, NULL);
         if (result) {
             return result;
         }

src/command/cmd_defs.c

@@ -2343,20 +2343,27 @@ static struct cmd_t command_defs[] =
     },
 
     { "/avatar",
-        parse_args, 1, 1, NULL,
+        parse_args, 2, 2, &cons_avatar_setting,
         CMD_NOSUBFUNCS
         CMD_MAINFUNC(cmd_avatar)
         CMD_TAGS(
             CMD_TAG_CHAT)
         CMD_SYN(
-            "/avatar <barejid>")
+            "/avatar get <barejid>",
+            "/avatar open <barejid>",
+            "/avatar cmd <command>")
         CMD_DESC(
             "Download avatar (XEP-0084) for a certain contact. "
             "If nothing happens after using this command the user either doesn't have an avatar set at all "
             "or doesn't use XEP-0084 to publish it.")
         CMD_ARGS(
-            { "<barejid>", "JID to download avatar from."})
-        CMD_NOEXAMPLES
+            { "get <barejid>", "Download the avatar. barejid is the JID to download avatar from."},
+            { "cmd <command>", "Set a command to execute with 'avatar open'. Use your favourite image viewer here."},
+            { "open <barejid>", "Download avatar and open it with command."})
+        CMD_EXAMPLES(
+            "/avatar get someone@contacts.org",
+            "/avatar cmd xdg-open",
+            "/avatar open someone@contacts.org")
     },
 
     { "/os",

src/command/cmd_funcs.c

@@ -8733,7 +8733,19 @@ cmd_color(ProfWin *window, const char *const command, gchar **args)
 gboolean
 cmd_avatar(ProfWin *window, const char *const command, gchar **args)
 {
-    avatar_get_by_nick(args[0]);
+    if (args[1] == NULL) {
+        cons_bad_cmd_usage(command);
+        return TRUE;
+    }
+
+    if (g_strcmp0(args[0], "get") == 0) {
+        avatar_get_by_nick(args[1], false);
+    } else if (g_strcmp0(args[0], "open") == 0) {
+        avatar_get_by_nick(args[1], true);
+    } else if (g_strcmp0(args[0], "cmd") == 0) {
+        prefs_set_string(PREF_AVATAR_CMD, args[1]);
+        cons_show("Avatar cmd set to: %s", args[1]);
+    }
 
     return TRUE;
 }